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Garmin Fēnix 8 (47mm) vs Whoop MG

Physical
Case diameter 47 mm —
Case thickness 13.8 mm —
Weight 80 g —
Case material Polymer —
Bezel material Titanium —
Lens / crystal Corning® Gorilla® Glass or sapphire crystal —
Strap material silicone —
Strap width — —
Colors available — —
Water resistance 100 m —
Military standard — —
Display
Display type AMOLED —
Display diagonal 1.4 mm —
Resolution width 454 px —
Resolution height 454 px —
Touchscreen No No
Always-on display No No
Max brightness — —
Battery
Smartwatch mode 384 h —
GPS-only mode — —
All-systems GPS mode — —
Max battery saver mode — —
Charging type Garmin proprietary plug charger —
Solar charging No No
Wireless charging No No
Positioning
GNSS systems — —
Multi-band / dual-frequency Yes No
Offline maps No No
Built-in maps Yes No
Turn-by-turn navigation No No
Sensors
Optical heart rate Yes No
ECG Yes No
SpO2 / pulse oximeter Yes No
Skin temperature No No
Accelerometer No No
Gyroscope No No
Compass Yes No
Barometric altimeter Yes No
Ambient thermometer No No
Microphone No No
Speaker No No
Connectivity
Bluetooth No No
Wi-Fi Yes No
NFC payments No No
Cellular / LTE Yes No
ANT+ No No
Music storage No No
Third-party apps No No
Satellite communication Yes No
Health & Fitness
Sleep tracking Yes No
Stress tracking No No
HRV tracking Yes No
Training load Yes No
Training readiness / recovery Yes No
VO2 max estimate Yes No
Running dynamics No No
Body battery / energy score No No
Menstrual cycle tracking Yes No
Fall / incident detection No No
Guided workouts No No
Multisport / triathlon mode Yes No
Software
Operating system — —
Companion app — —
Voice assistant — —
Contactless payments No No